Blister pack

ABSTRACT

[Problems to be Solved] 
     To provide a blister pack which can be easily torn off and peeled by automatically adjusting a position of tearing off and peeling even if a seal member becomes diagonally with respect to a longitudinal direction of a main body portion (storage recess portion) of the blister pack. 
     [Solution] 
     The blister pack includes a main body portion  1  and seal member  2.  The main body portion  1  includes a rectangular storage recess portion ( 1   a ) recessed at a center thereof and a plane portion for seal member adhesion ( 1   b ) provided around the storage recess portion ( 1   a ). The plane portion for seal member adhesion ( 1 ) is formed in a direction parallel with the longitudinal direction of the storage recess portion ( 1   a ), and on the right and left sides. The seal member ( 2 ) has a gripping part ( 2   a ) protruding at least one end in the longitudinal direction of the main body portion ( 1 ). The seal member ( 2 ) seals a content adhered to the plane portion for seal member adhesion ( 2   b ) and stored in the storage recess portion ( 1   a ), and is torn off and peeled from the gripping part ( 2   a ). The one end of the main body portion ( 1 ) is protruded to be a convex shape having an apex toward the side opposite to the storage recess portion, and formed to be line symmetry with respect to a center axis in a direction parallel with the longitudinal direction of the storage recess portion ( 1   a ).

BACKGROUND OF THE INVENTION

1. Field of the Invention

The present invention relates to a blister pack, which can be easily unsealed

2. Description of the Conventional Art

A blister pack including a main body portion and a seal member has been widely used in a package in a toiletry field, such as a toothbrush, etc., a stationery field, such as a stapler, etc., a food filed, such as a ham and a sausage, etc., and a medical device field, such as a syringe and a needle. The main body portion has a storage recess portion made by thermoforming a plastic sheet utilizing vacuum or compressed air. The seal member seals the storage recess portion of the main body portion.

In such a blister pack, there are advantages, for example, high sealing property to a stored item can be easily ensured, and handling is very easy because taking out the stored item is easy.

However, for ensuring the high sealing property, it is necessary to tightly adhere the seal member to the main body portion storing the stored item, so that large force may be necessary to unseal.

In a case that a blister pack is sealed tightly as such, generally, the blister pack is unsealed along the longitudinal direction of the main body portion (storage recess portion) thereof. As illustrated in FIG. 6 (I), as the length of the adhesive portion, in which the seal member is torn-off and peeled from the main body portion, is short when unsealing, a user can easily unseal the seal member with small force. For example, as illustrated in FIG. 6 (II), when a user unseals the adhesive portion in the rectangular direction to the longitudinal direction of the main body portion, the length of the adhesive portion torn-off and peeled from the main body portion becomes very long, so that greater force is necessary to unseal the seal member.

From such a point of view, generally, a blister pack is unsealed along the longitudinal direction of the main body portion (storage recess portion). However, if an user does not unseal carefully, the blister pack may be unsealed diagonally, as illustrated in FIG. 7 (II). In such a case, the user needs greater force and often takes time to unseal. In addition to this, there are many fears that the user drops the blister pack or the stored item. Thus, it has become a big problem.

For solving the problem that greater force is necessary to unseal the blister pack, for example, Japanese Patent Application Laid-Open No. 2011-148525 discloses a blister pack having the following configuration. That is, the blister pack includes a blister sheet and an adhesive sheet. The blister sheet has a blister case having a storage portion, which can store an item to be stored. The adhesive sheet adheres to the blister sheet so as to cover an opening portion of the storage portion of the blister case. In this configuration, on the surrounding of the blister case, an annular seal portion for sealing the blister sheet and the adhesive sheet is provided. On the outside of the annular seal portion, a seal area for sealing the blister sheet and the adhesive sheet is provided sandwiching an easy peel area. The easy peel area is composed of a weak seal area or a non-seal area. In the weak seal area, the seal strength is weaker than the seal strength between the blister sheet and the adhesive sheet in the annular seal portion and the seal area. In the non-seal area, the blister sheet and the adhesive sheet are not sealed each other. In addition, an unsealing start point portion is provided on the seal area. The unsealing start point portion is a start point for unsealing the adhesive sheet from the blister sheet toward the easy peel area side. The seal between the adhesive sheet and the blister sheet in the annular seal portion can be peeled via the easy peel area by peel force for peeling the adhesive sheet in the seal area from the unsealing start point portion.

This blister pack is characterized in that the easy peel area being an area with weak seal strength or a non-seal area is provided, to thereby be easily unsealed. However, it is difficult to secure high sealing property because of the easy peel area. Further, the structure is complicated and forces an user to unseal the blister pack from the unsealing start point portion formed in the blister pack toward the easy peel area. Thus, there is a problem that it is very inconvenient.

SUMMARY OF THE INVENTION Problems to be Solved by the Invention

In view of the above problem, the present invention is directed to provide a blister pack, in which a seal member can be easily torn off and peeled. by automatically adjusting the course of the position to be torn off and peeled, even when the seal member becomes diagonal to the longitudinal direction of the main body portion of the blister pack at a time of starting to unseal the blister pack.

Means to Solve the Problems

The present inventors worked earnestly to solve the above problem and reached the following conclusion. That is, the blister pack includes a main body portion and a seal member. The main body portion includes a rectangular storage recess portion recessed at a center thereof, and a seal member adhering plane portion provided around the storage recess portion. The seal member adhering plane portion is formed in a direction parallel with the longitudinal direction of the storage recess portion, and on the right and left sides of the longitudinal direction. The seal member has a gripping part extending beyond at least one end in the longitudinal direction of the main body portion. And the seal member is to be adhered to the seal member adhering plane portion to thereby seal a stored item in the storage recess portion, and is to be torn off and peeled from the gripping part. Further, the one end of the main body portion is protruded to be a convex shape having an apex toward the side opposite to the storage recess portion, and is formed to be line symmetry with respect to a center line in a direction parallel with the longitudinal direction of the storage recess portion. Having such a structure, even if the seal member is diagonally torn off at a time of starting to unseal the blister pack, the seal member rotates around the apex of the one end of the main body portion, regardless of the presence or absence of consciousness of the user. Then, the seal member is automatically adjusted so as to be torn off along the longitudinal direction of the main body portion (storage recess portion). Thus, large force is not necessary since the seal member will not be turn off diagonally. Further, as going to peel off, the peeling line reaches the storage portion which does not adhere to the seal member, so that the adhesive distance is shorten, and thus the large force is not necessary to peel off. Thus, by only adjusting the direction of peeling off at the one end of the main body portion at a starting time of peeling off, the user can easily peel off the seal member.

That is, the present invention is a blister pack including a main body portion and a seal member. The main body portion includes a storage recess portion recessed at the center thereof and a seal member adhering plane portion provided around the storage recess portion. In the main body portion, the seal member adhering plane portion is formed in a direction parallel with the longitudinal direction of the storage recess portion having a rectangular shape, and on the right and left sides of the longitudinal direction. The seal member has a gripping part extending beyond at least one end in the longitudinal direction of the main body portion. The seal member is to be adhered to the seal member adhering plane portion to thereby seal a stored item in the storage recess portion, and is to be torn off and peeled from the gripping part. Further, the one end of the main body portion is protruded to be a convex shape, which has an apex toward the side opposite to the storage recess portion, and is formed to be line symmetry with respect to a center line in a direction parallel with the longitudinal direction of the storage recess portion.

Further, if a flange portion is further formed around the seal member adhering plane portion of the main body portion via a step portion, the flange portion can increase strength and rigidity of the blister pack. Further, at the one end of the longitudinal direction of the main body portion, the flange portion and a part of the gripping part of the seal member are overlapped, and thus it can prevent that the seal member from being torn off accidentally, so that it is preferable.

EFFECT OF THE INVENTION

The blister pack according to the present invention includes the main body portion and the seal member. The main body portion includes a rectangular storage recess portion recessed at a center thereof and a seal member adhering plane portion provided around the storage recess portion. The seal member adhering plane portion is formed in a direction parallel with the longitudinal direction of the storage recess portion, and on the right and left sides of the longitudinal direction. The seal member has a gripping part extending beyond at least one end in the longitudinal direction of the main body portion. The seal member is to be adhered to the seal member adhering plane portion to thereby seal a stored item in the storage recess portion, and is to be torn off and peeled from the gripping part. Further, the one end of the main body portion is protruded to be a convex shape, which has an apex toward the side opposite to the storage recess portion, and is formed to be line symmetry with respect to a center line in a direction parallel with the longitudinal direction of the storage recess portion. Having such a structure, even if the seal member is diagonally torn off at a time of starting to unseal the blister pack, the seal member rotates around the apex of the one end of the main body portion, regardless of the presence or absence of consciousness of the user. Then, the seal member is automatically adjusted so as to be torn off along the longitudinal direction of the main body portion (storage recess portion). Thus, large force is not necessary since the seal member will not torn off diagonally. Further, as going to peel off, the peeling line reaches the storage portion which does not adhere to the seal member, so that the adhesive distance is shorten, and thus the large force is not necessary to peel off. Thus, by only adjusting the direction of peeling off at the one end of the main body portion at a starting time of peeling off, the user can easily peel off the seal member. Furthermore, since it is not necessary to change the adhesion force of the location, etc., the blister pack can be easily produced.

Further, in an embodiment in which a flange portion is formed around the seal member adhering plane portion of the main body portion via a step portion, the flange portion can increase strength and rigidity of the blister pack. In addition, at the one end of the longitudinal direction of the main body portion, the flange portion and a part of the gripping part of the seal member are overlapped, and thus it can prevent the seal member from being torn off accidentally, so that it is preferable.

BRIEF EXPLANATION OF DRAWINGS

FIG. 1 is a front view illustrating an exemplary embodiment of the blister pack according to the present invention.

FIG. 2 is an explanation view illustrating a procedure of peeling off the seal member in the blister pack illustrated in FIG. 1.

FIG. 3 is a front view illustrating another exemplary embodiment according to the present invention.

FIG. 4 is a left side view of the blister pack illustrated in FIG. 3.

FIG. 5 is a front view illustrating another exemplary embodiment of the blister pack according to the present invention.

FIG. 6 is an explanation view illustrating a difference by the direction of peeling off the seal member in the conventional blister pack.

FIG. 7 is an explanation view illustrating a difference between the case of peeling off diagonally and the case of peeling off horizontally when the seal member is torn off in the longitudinal direction of the conventional blister pack.

DETAILED DESCRIPTION OF PREFERRED EMBODIMENT

The blister pack according to the present invention will be described, referring to drawings as follows.

A main body portion 1 includes a storage recess portion 1 a, which has a rectangular shape and is recessed at a center thereof, and a seal member adhering plane portion 1 b. The seal member adhering plane portion 1 b is formed in parallel to the longitudinal direction of the storage recess portion 1 a at right and left sides. The rectangular shape in the present invention widely means the shape having a longer vertical width with respect to a horizontal width. As each exemplary embodiment illustrated in figures, the rectangular shape includes a shape in which each corner thereof has an arc-shape, and an elliptical shape.

In this blister pack, it is preferable that the seal member adhering plane portion 1 b is formed to have a shape which is in a direction parallel with the longitudinal direction of the storage recess portion 1 a and formed symmetrically in left and right sides. If the seal member adhering plane portion 1 b is formed to have such a shape, which is in a parallel direction with the longitudinal direction of the storage recess portion 1 a and formed symmetrically in left and right sides, the following effect is obtained. That is, when an adhered seal member 2, which is described later, is torn off and peeled along the longitudinal direction of the main body portion (storage recess portion 1 a), an uniform force is applied to the left and right, so that it is hard to be diagonally.

Further, one end of the longitudinal direction of the main body is protruded to be a convex shape, which has an apex toward the side opposite to the storage recess portion, and is formed to be line symmetry with respect to a center line parallel in the longitudinal direction of the storage recess portion.

Having such a structure, even if the seal member 2 is diagonally torn off at a time of starting to unseal the blister pack (FIG. 2 (I)), the seal member 2 rotates around the apex of the one end of the longitudinal direction the main body portion (FIG. 2 (II), (III)), regardless of the presence or absence of consciousness of the user. Then, the seal member 2 is automatically adjusted so as to be torn off along the longitudinal direction of the main body portion 1 (storage recess portion 1 a) (FIG. 2 (N)).

The seal member 2 has a gripping part 2 a which extends beyond at least one end of the longitudinal direction of the main body portion 1. The seal member 2 is to be adhered to the seal member adhering plane portion 1 b to thereby seal a stored item stored in the storage recess portion 1 a, and is to be torn off and peeled from the gripping part 2.

A flange portion 3 is formed around the seal member adhering plane portion 1 b via a step portion 3 a.

Then, the specific configuration of the blister pack according to the present invention will be described in detail. The one end of the longitudinal direction of the main body portion 1 is protruded to be a convex shape having an apex toward the side opposite to the storage recess portion 1 a, as illustrated in FIGS. 1, 3 and 5. Further, the one end of the longitudinal direction of the main body portion 1 is formed so as to be in line symmetry with respect to the center line in a direction parallel with the longitudinal direction of the storage recess portion 1 a (main body portion 1).

By forming the one end of the longitudinal direction of the main body portion 1 to be in line symmetry with respect to the center line, even when the seal member 2 is almost diagonally torn off at a time of starting to unseal the blister pack, the seal member 2 rotates around the apex of the one end of the longitudinal direction of the main body portion 1, and is automatically adjusted so as to be torn off along the longitudinal direction of the main body portion 1 (storage recess portion) 1 a.

In other words, by contacting the seal member 2 to the rotatable apex, the direction of peeling off the seal member 2 is naturally adjusted to the state in which the length of adhesive part is shortest and the force for peeling off is least. That is, the state is the direction along the longitudinal direction of the main body portion 1 (storage recess portion 1 a) of the blister pack. Taking this configuration, even if a user does not strongly aware the direction of the seal member 2, the user can very easily peel off the seal member 2 along the longitudinal direction of the main body portion 1 (storage recess portion 1 a).

Further, since it is sufficient that the one end of the longitudinal direction of the main body portion 1 of the blister pack is in line symmetry with respect to the center line in parallel, it can have an exemplary embodiment that a plurality of apexes is protruded as illustrated in FIG. 5.

Furthermore, as illustrated in FIGS. 3 and 4, in the exemplary embodiment in which a flange portion 3 is formed around the seal member adhering plane portion 1 b via a step portion 3 a, the flange portion 3 a can be integrally formed with the main body portion 1, so that it is easy to produce. In addition, this configuration can increase strength and rigidity of the blister pack. Further, as illustrated in FIG. 4, the flange portion 3 and a part of the gripping part 2 a of the seal member 2 are overlapped, so that it can prevent the seal member 2 from being torn off accidentally. In addition, a slight gap generates between the seal member 2 and the flange portion 3 by a step portion 3 a and they are not in close contact. Thus, the user can easily grip the gripping part 2 a of the seal member 2 and the usability is good. 

What is claimed is;:
 1. A blister pack comprising a main body portion (1) and a seal member (2), wherein the main body portion (1) comprises a rectangular storage recess portion (1 a) recessed at a center thereof, and a seal member adhering plane portion (1 b) provided around the storage recess portion (1 a), wherein the seal member adhering plane portion (1 b) is formed in a direction parallel with the longitudinal direction of the storage recess portion (1 a), and on the right and left sides of the longitudinal direction, wherein the seal member (2) has a gripping part (2 a) extending beyond at least one end in the longitudinal direction of the main body portion (1), wherein the seal member (2) is to be adhered to the seal member adhering plane portion (1 b) to thereby seal a stored item in the storage recess portion (1 a), and is to be torn off and peeled from the gripping part (2 a), and wherein one end of the main body portion (1) is protruded to be a convex shape having an apex toward the side opposite to the storage recess portion (1 a), and is formed to be line symmetry with respect to a center line in a direction parallel with the longitudinal direction of the storage recess portion (1 a).
 2. The blister pack according to claim 1, wherein a flange portion (3) is further formed around the seal member adhering plane portion (1 b) of the main body portion (1) via a step portion (3 a). 